LEPIDOPTÉROLOGIE COMPAREE 4O7 



What has been said about the food plants of pilzii applies 

 equally to this, for both behave in exactly the same way. 



ist INSTAR. 



Length as in pilzii. 

 There is practically no différence between this larva and that 

 of pilzii at this stage, the only différence observable being the 

 tendency of the white spot on the future position of the supraspi- 

 racular stripe to be more hirtaria like than in pilzii. 



2nd INSTAR. 



Length at end : 8,75 mm. 



Again, the larva approaches more closely to hirtaria than does 

 pilzii. The coUar appears more like a séries of yellowish spots 

 and in ail the other places where the larvas are yellow spotted, the 

 spots are more distinct in htinii. 



3rd INSTAR. 



Length as in pilzii. 



The head, in this instar, is deader black than in pilzii and what 

 pale markings there are on it, are more sharply outlined. The 

 hairs on the face however, are shorter. In the body, the tvvo are 

 very much alike; nevertheless the foUowing points of différence 

 are readily made out. In himïi, the longitudinal stripes on the 

 early abdominal segments are very slightly différent from those in 

 pilzii, but on the thoracic and the last abdominal segments they 

 are markedly brighter or yellower, that is, they are not so inclined 

 to grey or to the ground colour. 



The yellow transverse bars in the présent form, are brighter and 

 therefore more hirtaria like in colour. 



The pale marbling on the anal plate of pilzii fails to appear 

 until later in hnnii. In hunii, the plate on the anal prolegs is 

 black, yellow marked, but to a much less extent than in pilzii. 

 Another point of différence is in the subspiracular spot, which, in 

 pilzii, in a somewhat contradictory fashion, is larger, rounder and 



